William l



W. L. DAYTON.

PUMP JACK.

APPLICATION FILED MAR. 20, 1918.

1,309,842., Patented July 15, 1919.

2 SHEETSSHEET I.

W. L. DAYTON.

PUMP JACK.

APPLICATION FILED MAR. 20. 191B.

Patented July 15, 1919.

2 SHEETS-SHEET 2.

- weight-so that the weight not retard or hinder the downstroke.

WILLIAM L. DAYTON,

013. FORT WORTH, TEXAS, ASSIGNOR. TO GRAVITY PUMP AND POWER- G'O., OFFORT WORTH, TEXAS.

PUMP-JACK Specification of Letters Patent. Patented July 15, 1919.

Application filed March 20, 1918.- Serial No. 223,482.

To all whom it may concern:

Be it known that I, WILLIAM L. DAYTBN, a citizen of the United States ofAmerica, residing at Fort lVorth, in the county of Tarrant and State ofTexas, have invented certain-new and useful Improvements in Pump-Jacks,of which the following is a specification.

My invention relates to pump jacks and more particularly to means foraiding the ower mechanism of pump jacks; and the object is to providesimple gravity actuated devices for aiding the driving or actuatingmechanism of the pump jacks so that less power will be required and sothat the pump jack will operate with less jerking and work more evenly.One object is to provide means for automatically shifting a cooperatingwill aid the pump jack onthe upstroke of the pump jack for lifting theload and then to shift the weight on the down stroke so that the weightwill Other objects and advantages will be fully explained in thefollowing description and the invention will be more particularlypointed out in the claims.

Reference is had to the drawings which form a part cation.

Figure 1 is a side elevation of the pump jack. Fig. 2 is a plan view ofthe same. Fig. 3 is a side elevation of a pump jack which is a variationfrom the pump jack previously shown. Fig. 4 is a plan view of the pumpjack shown in Fig. 3. Fig. 5 is a detail view of the cranks 45 and 47.

Similar characters of referenceare used to indicate the same partsthroughout the several views.

The pump jack is provided with a main frame composed of parts or members1 and 2 which are duplicates inconstruction and these frame members areconnected by bars 33 and 4-4 and by the shafts 5 and 6. A'balance wheelis mounted on the power shaft 5 and apower the shaft 5. A pinionaccompanying of this appli- 9 is mounted on shaft 5 and meshes with anddrives a cog wheel shaft .6. A crankll is -that the weight 20-f is 10which drivesrigid with shaft 6. The crank'6' is the main actuating.element machine is provided with a walking beam 12 which is actuatedfrom the crank 11" by wheel 8 is mounted on levers 25 and 26. A

of the pump. jack. The and farthest away from means of a lever-pitman 13which is pivotally connected to the crank 11 and connected to thewalking beam by a pivot bolt 14 which has a sliding engagement with thewalking beam 12, the walking beam having a curved slot 15 which permitsmovement of the walking beam 12 and the lever-pitman 14 relative to eachother. The walking beam 12 is fulcrumed in a frame which is in part anextension of the main frame and will be referred to as the fulcrum frameand this frame is composed of a frame member 16 which is connected tothe cross bars 47% and a frame member 17 one side of which is integralwith the frame member 1. The-fulcrum frame is braced by the cross bars4-4 and by cross bars 18 and by the fulcrum bar 19. V The object inextending the pitman rod 13 above the walking beam 12 is to move aweight 20 which aids the driving power mechanism. The full lineillustration in Fig. 1 shows the weight 20 near the extreme limit of itsmovement. The pitman-lever 13 is pivotally connected to the walking beamat 21 and the bolt 14 serves as a guide to keep the lever or pitman 13and walking beam inproper working relation, that is, parallel to eachother. The arm 23 which carries the weight 20 is pivotally connected tothe pitman-lever 13 and runs over an idler 22 which is mounted on thepower end of the walking beam 12. The weight 20 can be moved toward andfrom the fulcrum 19 of the walking beam 12 by means of the crank 11 andthe pitman lever 13 for cooperating with driving power mechanism, butmeans are provided for automatically shifting the weight 20 by theweight of the sucker rod and the sucker rod connection..24 so that thedriving power mechanism will be relieved of-that function. A bell cranklever 25 is fulcrumed on the work end of the walking beam 12 and a bellcrank lever 26 link bar 27 is pivotally connected to the crank nectedwith the crank 11. A pitman bar 30 is pivotally connected to crank28 andto the lever- 26. The... mechanism is so timed at the highest point thefulcrum 19 when the sucker rod ls'a't its lowest point and when the work.end of the walking beam 28 is rigidly conthe stub reaches its highestpoint, the weight 20 soon begins to move away from the fulcrum 19 andmoves on outwardly and upwardly as the work end of the walking beamcarries the sucker rod down. As the work end pulls the sucker rodupwardly, the weight 20 is moving toward the fulcrum 19 and movingdownwardly at the same time.

The variation shown in Figs. 3 and 4 include an additional weight 31 andcertain variations inthe means for shifting the weights. There is aslight variation in the frame also. The form shown in Figs. 3 and 4 hastwo frame members 32 and 33 which are braced to each other by cross bars34. The frame members 32 and 33 will also be braced to some extent bythe power shaft 35, and by the fulcrum bar 37. A power wheel 38 and abalance wheel 39 are rigid with shaft 35. A pinion 40 is rigid withshaft 35 and meshes with and drives a cog wheel 41 which drives theshaft 36. A walking beam 42 is fulcrumedin the frame members 32 and 33by means of a fulcrum bar 37. A bell crank lever 43 is fulcrumed on thebeam 42 and a sucker rod 44 is pivotally connected to the lever 43. Thebeam 42 is actuated by a pitman bar 46 and a crank 45, the latter beingrigid with shaft 36, the shaft 36 being composed of two stub shafts andthe crank 45 being in two parts, one part connected to one of the stubshafts and the other part being connected to the other stub shaft. Thebell crank lever 43 cotiperates with the walking beam 42 in operatingthe sucker rod, and means are provided for actuating the lever 43. Acrank 47 is rigid with the shaft 36 and is pivotally connected to a linkbar 48 which is pivotally connected to the bell crank lever One part ofthe crank 45 and-one part of the crank 47 are integral with each other.Two weights 31 and 49 co5perate with the walking beam 42 for actuatingthe sucker rod. These weights are shiftable by means of a bar 50 whichis slidably mounted in bearings 51 and 52 which are rigid with the beam42. A lever 53 isfulcrumed on the walking beam 42 and is pivotallyconnected to the bar 50. The lower end of the lever 53 has two arms 54.Cranks 55 are rigid with shafts 36 and are pivotally connected to linkbars 56 which are pivotally connected to the arms 54. By the means thusdescribed the weights'31 and 49 are shifted to the farthest point fromthe fulcrum 37 just as the walking beam 42 starts to pull the sucker rod44 upwardly and to shift the weights toward the fulcrum 37 on thedownstroke of the sucker rod connection 44. The weights areautomatically shifted to increase the working power of the Walkin beam42.

at I claim, is,-

1. A pump jack comprising a frame, a

said frame, a

connections for the other end of said lever with said shaft foractuating said walking beam and said Weight. I

2. A pump jack comprising a frame, a walking beam fulcrumed on saidframe, a power Wheel provided with a shaft journaled in said frame, alever fulcrumed on said walking beam, a shiftable weight connectedto oneend of said lever and guiding connection of said lever with said walkingbeam to hold the lever and the walking beam in operative relation, andoperative connections for the other end of said lever with said shaftfor actuating said walking beam and weight.

3. A pump jack comprising a frame, a walking beam fulcrumed on .saidframe, a power wheel provided with a power shaft 1ournaled in saidframe, a crank shaft journaled in said frame and gearing for drivingsaid crank shaft from said power shaft, a lever fulcrumed on saidwalking beam and having one end operatively connected to said crankshaft, and a shiftable weight provided with an antifriction bearingmounted on said walking beam and operatively con.- nected to the otherend of said lever.

4. A pump jack comprising a frame, a walking beam fulcrumed on saidframe, a power wheel provided with a power shaft journaled in saidframe, a crank shaft journaled in said frame and gearing for drivingsaid crank shaft from said power shaft, a

lever fulcrumed on said walking beam and" vided with an antifrictionbearing mounted on the power end of said walking beam and operativelyconnected to the other end of said lever, said walking beam having acurved slot therein, and a guiding connection of said moving in saidslot.

5. A pump jack comprising a frame, a walking beam fulcrumed on saidframe, a power wheel provided with a power shaft ournaled in said frame,a lever fulcrumed on the power end of said walking beam and operativelyconnected with said power shaft, a shiftable weight provided with anantifriction bearing mounted on said walking beam, and a bell cranklever fulcrumed on the work end of said walking beam with one arm to beconnected to a sucker rod and the other arm operatively connected tosaidwalking beam fulcrumed on said frame, a

power wheel.

provided with a power shaft journaled 1n said frame, a crank shaftjourleve'r with said walking beam with said crank shaft, and a bellcrank shaft fulcrumed on the work end of said Walking beam andoperatively connected With said 10 crank shaft. I In testimony whereof,I set my hand, this 21st day of January, 1918.

WILLIAM L. DAYTON.

